Using the mtcars dataset we plot can attempt to
understand the relationship of various factors to gas mileage
(mpg).
We plot weight (wt) vs. mileage (mpg)
spatially along the x/y axes. We visualize the number of cylinders
(cyl) as colors and the amount of horsepower
(hp) as the size of an individual point in the plot.
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## Warning: `line.width` does not currently support multiple values.
## Warning: `line.width` does not currently support multiple values.